Processing box

Abstract

A process cartridge includes: a developing unit including a developing frame and a developing roller rotatably disposed on the developing frame about an axis extending in a first direction; a protective cover; and an isolation member for isolating the charging roller and the photosensitive drum, the isolation member being movable on the process cartridge from a first position to a second position, in an initial state, the protective cover is arranged on at least one part of the drum unit and / or the developing unit, the isolation component is locked at a first position and abuts against the charging roller, so that a gap is at least partially formed between the charging roller and the photosensitive drum, and the second elastic piece is deformed to store force; the protective cover is taken down from the processing box, so that the isolation component is unlocked, the second elastic piece recovers deformation, so that the charging roller moves towards the photosensitive drum, and the isolation component is pushed by the charging roller to move from the first position to the second position in the direction away from the charging roller after being unlocked, so that the charging roller is in contact with the photosensitive drum.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of optical image forming, and particularly relates to a process cartridge. BACKGROUND

[0002] In the internal structure of an image forming apparatus (for example, a printer, a copier), a process cartridge plays a vital role, responsible for completing the core process of converting from an electronic signal to a physical image. The process cartridge generally includes two major parts, a drum unit and a developing unit, wherein the drum unit is mainly composed of a photosensitive drum and a charging roller, and the developing unit contains a developing roller and other key components. In the printing process, the photosensitive drum in the drum unit first forms a uniform charge layer on its surface by contacting the charging roller. Subsequently, a laser beam selectively irradiates the photosensitive drum surface according to the information of the image to be printed, eliminating the charge in some areas, thereby forming an electrostatic latent image corresponding to the original image on the drum surface. Then, the developing roller in the developing unit carries charged carbon particles close to the photosensitive drum, and due to electrostatic action, the carbon powder is attracted to the area of the photosensitive drum with the electrostatic latent image, completing the developing process.

[0003] The photosensitive drum is generally made of an aluminum tube, with a layer of photosensitive material coated on its surface, and the surface of the charging roller is usually rubber structure. The time interval from the completion of process cartridge production and manufacturing to the sale to various printer users and the start of use is often long. If the photosensitive drum and the charging roller surface are in contact for a long time, the rubber structure on the shaft sleeve surface of the charging roller will contaminate the photosensitive coating on the surface of the photosensitive drum, causing serious quality defects in printing.

[0004] In the prior art, a separation pin is usually installed between the charging roller and the photosensitive drum to form a protective gap. The separation pin is mostly placed from the two side covers of the process cartridge. During the production process of the process cartridge, the separation pin needs to be inserted during assembly of the process cartridge. Before use, the user needs to remove the separation pin. However, in practice, there are problems such as not smooth enough operation of removing the separation pin and the user forgetting to remove the pin, which affects printing. SUMMARY

[0005] According to an aspect of the utility model, a process cartridge is provided for detachable installation in an image forming apparatus, comprising:

[0006] a drum unit including a drum frame, a photosensitive drum rotatably disposed on the drum frame around an axis extending in a first direction, a charging roller rotatably disposed on the drum frame around the axis extending in the first direction, and a second elastic member for moving the charging roller in a direction towards the photosensitive drum;

[0007] a developing unit including a developing frame and a developing roller rotatably disposed on the developing frame around the axis extending in the first direction;

[0008] a protective cover; and

[0009] an isolation member for isolating the charging roller and the photosensitive drum, the isolation member being movable on the process cartridge from a first position to a second position;

[0010] In an initial state, the protective cover is arranged on at least part of the drum unit and / or the developing unit, the isolation member is locked in the first position and abuts against the charging roller, so that the charging roller and the photosensitive drum have a gap therebetween at least in part, and the second elastic member is deformed to store energy; the protective cover is removed from the process cartridge, so that the isolation member is unlocked, the second elastic member restores the deformation, so that the charging roller moves towards the photosensitive drum, and the isolation member is pushed by the charging roller to move from the first position to the second position away from the charging roller, so that the charging roller contacts the photosensitive drum.

[0011] The protective cover and the isolation member capable of linkage are arranged, when the protective cover is not removed, the isolation member makes the charging roller and the photosensitive drum have a gap therebetween, when the protective cover is removed, the isolation member is unlocked, so that the gap between the charging roller and the photosensitive drum is automatically removed, the process cartridge can be installed and worked, compared with the prior art that the protective cover and the isolation pin are removed, the protective cover is only removed in the present application, the operation process of the user is reduced, and the situation that the user only remembers to remove the protective cover and forgets to remove the isolation pin, so that the process cartridge cannot work normally, is avoided.

[0012] In some embodiments, the process cartridge further comprises a first elastic member for moving the developing unit towards a contact position where the developing roller contacts the photosensitive drum;

[0013] The protective cover is provided with an abutting portion;

[0014] In an initial state, the abutting portion abuts against the developing unit, so that the developing unit is located at a separation position where the developing roller is separated from the photosensitive drum, the first elastic member is deformed to store energy, the isolation member is located at the first position, the charging roller and the photosensitive drum have a gap therebetween at least in part, and the second elastic member is deformed to store energy; the protective cover is removed from the process cartridge, so that the abutting portion is separated from the developing unit, the first elastic member restores the deformation, so that the developing unit moves towards the contact position where the developing roller contacts the photosensitive drum, the developing unit drives the isolation member to be unlocked, so that the isolation member can be pushed by the charging roller to move from the first position to the second position, and the second elastic member restores the deformation, so that the charging roller moves towards the photosensitive drum and contacts the photosensitive drum.

[0015] In some embodiments, the isolation member comprises an isolation portion, at the first position, the isolation portion is inserted between the charging roller and the photosensitive drum, so that the charging roller moves away from the photosensitive drum, and the isolation portion is arranged to be capable of sliding from the first position to the second position to be away from the charging roller, so that the charging roller contacts the photosensitive drum.

[0016] In some embodiments, the isolation member is configured to slide along the first direction from the first position to the second position.

[0017] In some embodiments, the developing unit is provided with a force applying part, the drum unit is provided with a locking structure, the isolation member further comprises a force receiving part and a locking part, and the isolation member is configured to rotate;

[0018] In the first position, the locking part is locked with the locking structure; when the developing unit moves to the contact position, the force applying part acts on the force receiving part to make the isolation member rotate, and the locking part rotates to move away from the locking structure to be unlocked, after which the isolation member can slide from the first position to the second position.

[0019] In some embodiments, the isolation member is configured to rotate around an axis extending along the first direction.

[0020] In some embodiments, the isolation member further comprises a rotating part, which is rotatably arranged on the drum frame;

[0021] The isolation part is arranged to protrude from the rotating part along the first direction;

[0022] The force receiving part is arranged to protrude from the rotating part along a direction perpendicular to the first direction;

[0023] The locking part is formed on the force receiving part.

[0024] In some embodiments, the locking part and the locking structure are mutually adapted inclined surfaces.

[0025] In some embodiments, the drum frame comprises an end cover, and the locking structure is formed on the inner side of the end cover;

[0026] The developing frame comprises a developing cover and a bearing, and the force applying part is arranged on the developing cover or the bearing.

[0027] In some embodiments, the end cover is provided with a receiving part, and the rotating part is rotatably arranged in the receiving part;

[0028] The receiving part is further connected to a limiting part for preventing the rotating part from coming out of the end cover along the first direction.

[0029] In some embodiments, the isolation part is provided with a first isolation inclined surface inclined to the first direction, the first isolation inclined surface is inclined to the direction of the photosensitive drum in the direction towards the charging roller, and the first isolation inclined surface is used to abut against the end part of the charging roller.

[0030] In some embodiments, the process cartridge further comprises an isolation boss fixedly arranged on the drum frame, and the isolation member and the isolation boss respectively abut against the two end parts of the charging roller in the first direction, so that the charging roller is completely not in contact with the photosensitive drum.

[0031] In some embodiments, the drum frame includes an end cover, the isolation boss is arranged on the inner side of the end cover, and a second isolation inclined surface inclined to the first direction is arranged on the isolation boss, the second isolation inclined surface is inclined to the direction of the photosensitive drum in the direction towards the charging roller, and the second isolation inclined surface is used for abutting against the end of the charging roller.

[0032] In some embodiments, the isolation member is arranged on the driving side of the process cartridge.

[0033] In some embodiments, the isolation member is arranged on the non-driving side of the process cartridge. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is an exploded view of the process cartridge of the first embodiment of the present application;

[0035] Figure 2 It is a structural schematic view of the process cartridge of the first embodiment of the present application on the driving side, wherein the developing unit is located at the separated position, and the isolation member is located at the first position;

[0036] Figure 3 It is a structural schematic view of part of the structure of the process cartridge of the first embodiment of the present application;

[0037] Figure 4 It is a structural schematic view of part of the structure of the process cartridge of the first embodiment of the present application on the driving side, wherein the isolation member is located at the first position;

[0038] Figure 5 It is a structural schematic view of the process cartridge of the first embodiment of the present application on the non-driving side;

[0039] Figure 6 It is a structural schematic view of the driving side end cover and the isolation member of the first embodiment of the present application, wherein the isolation member is located at the first position;

[0040] Figure 7 It is an exploded view of the driving side end cover and the isolation member of the first embodiment of the present application;

[0041] Figure 8 It is an exploded view of the driving side end cover and the isolation member of the first embodiment of the present application from another perspective;

[0042] Figure 9 It is a structural schematic view of the process cartridge of the first embodiment of the present application on the driving side, wherein the developing unit is located at the contact position, and the isolation member is located at the second position;

[0043] Figure 10 It is a structural schematic view of part of the structure of the process cartridge of the first embodiment of the present application on the driving side, wherein the isolation member is rotated by a certain angle from the first position;

[0044] Figure 11 Part structure of the processing box of the utility model embodiment one in the driving side structure diagram, wherein the isolation member is located in the second position;

[0045] Figure 12 Part structure of the processing box of the utility model embodiment two in the driving side structure diagram, wherein the isolation member is located in the second position;

[0046] Figure 13 Part structure of the processing box of the utility model embodiment two in the driving side structure diagram, wherein the isolation member is located in the second position;

[0047] Figure 14 Part structure of the processing box of the utility model embodiment two in the driving side structure diagram, wherein the isolation member is located in the second position;

[0048] Figure 15 Part structure of the processing box of the utility model embodiment two in the driving side structure diagram, wherein the isolation member is located in the second position;

[0049] Reference signs:

[0050] Drum unit 8, photosensitive drum 4, charging roller 5, second elastic member 51, drum frame 11, frame body 12, driving side end cover 13, first rotating hole 131, second rotating hole 132, guide hole 133, accommodating portion 134, limiting portion 135, locking structure 136, conductive side end cover 14, isolation boss 141, second isolation inclined surface 1411, drum coupling 15;

[0051] Developing unit 9, developing frame 21, box body 22, driving side bearing 23, conductive side bearing 24, developing coupling 25, developing cover 27, cylindrical portion 270, guide protrusion 271, force applying portion 272, developing roller 6;

[0052] First elastic member 3;

[0053] Protective cover 101, abutting portion 1011;

[0054] Isolation member 102, rotating portion 1021, isolation portion 1022, first isolation inclined surface 10221, stress receiving portion 1023, locking portion 1024. DETAILED DESCRIPTION

[0055] The utility model will be further explained in detail below in connection with the drawings, obviously, the described embodiment is the utility model part embodiment, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0056] It should be noted that the terms "first", "second" and the like in the description and in the claims are used for descriptive purposes only and do not necessarily connote an ordering of importance, sequence, or spatial arrangement. Thus, a feature described as "first" can also be termed a "second" feature, and vice versa without departing from the teachings of the present application. In the description, the meaning of "a plurality" is at least two, for example, two, three, etc., unless explicitly specified otherwise.

[0057] In the present application, unless specifically defined otherwise, the terms "mounting", "connecting", "fixed" and the like are to be construed broadly and are used for descriptive purposes only, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0059] In the above description, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the description and the features of different embodiments or examples without contradiction.

[0060] Embodiment one

[0061] The present embodiment provides a process cartridge which is detachably installed in an image forming apparatus. The process cartridge includes a drum unit 8, a developing unit 9, a protection cover 101, and a separation member 102.

[0062] Reference Figure 1For better illustrating the structure of the process cartridge of the embodiment, a three-dimensional rectangular coordinate system is established, the length direction of the process cartridge is defined as the first direction, the process cartridge has opposite left (driving side) and right (non-driving side, also called conductive side) in the first direction; the width direction of the process cartridge is defined as the second direction, the process cartridge has opposite front and back in the second direction, the drum unit 8 and the developing unit 9 are oppositely arranged in the width direction of the process cartridge, the drum unit 8 is located at the front end, and the developing unit 9 is located at the rear end; the height direction of the process cartridge is defined as the third direction, the process cartridge has opposite upper and lower in the third direction.

[0063] Referring to Figures 1-2 and Figure 12 , the drum unit 8 includes the photosensitive drum 4, the charging roller 5, the second elastic member 51, a cleaning blade, a drum coupling 15 and a drum frame 11, the drum frame 11 includes a frame body 12 and end covers, the end covers are respectively fixed on both ends of the frame body 12 along the first direction, i.e. a driving side end cover 13 on the driving side and a conductive side end cover 14 on the non-driving side, the frame body 12 encloses a waste powder bin for collecting waste developer, the conductive side end cover 14 is arranged at the right end of the drum frame 11, and the driving side end cover 13 is arranged at the left end of the drum frame 11; the photosensitive drum 4 is rotatably mounted on the driving side end cover 13 and the conductive side end cover 14 at both ends along the first direction, and the photosensitive drum 4 can rotate around an axis extending along the first direction; the charging roller 5 is also mounted on the drum frame 11 at both ends along the first direction, and the charging roller 5 is used for charging the surface of the photosensitive drum 4 with uniform electric charge, so that the photosensitive drum 4 can adsorb developer, and the charging roller 5 can rotate around an axis extending along the first direction. The charging roller 5 includes a roller shaft and a shaft sleeve sleeved on the roller shaft and rotating with the roller shaft. The second elastic member 51 is used for moving the charging roller 5 towards the photosensitive drum 4, so that the outer circumferential surface of the shaft sleeve of the charging roller 5 can tightly abut the outer circumferential surface of the photosensitive drum. The drum coupling 15 is connected with the left end of the photosensitive drum 4 and is rotatably mounted on the driving side end cover 13, and is used for receiving driving force from a main assembly side drum driving coupling member of the image forming device.

[0064] The driving side end cover 13 is provided with a first rotation hole 131 and a second rotation hole 132, both of which are through hole structures on the driving side end cover 13, and the rotation axis of the first rotation hole 131 extends in the first direction. The developing unit 9 is movable relative to the drum unit 8, so as to be moved from a separation position where the developing roller 6 is separated from the photosensitive drum 4 to a contact position where the developing roller 6 is in contact with the photosensitive drum 4, and the developing unit 9 is movable in a rotating manner or in a translational manner in other embodiments. In the present embodiment, the developing unit 9 is rotatably mounted on the drum frame 11, specifically, the left end of the developing unit 9 in the first direction is rotatably mounted on the first rotation hole 131 of the driving side end cover 13, and the right end of the developing unit 9 in the first direction is rotatably mounted on the conductive side end cover 14, so that the developing unit 9 is rotatable about the rotation axis of the first rotation hole 131. The drum coupling 15 is rotatably mounted in the second rotation hole 132 and drives the photosensitive drum 4, and the part of the drum coupling 15 exposed outside the second rotation hole 132 can receive the driving force of the image forming apparatus.

[0065] Referring to Figures 1-2 The developing unit 9 includes a developing frame 21, a developing coupling 25, the developing roller 6 and a powder feeding roller. The developing frame 21 includes a box body 22, a developing cover 27 and bearings, wherein the bearings include a driving side bearing 23 and a conductive side bearing 24. The inside of the box body 22 is hollow, and the box body 22 encloses a powder bin for storing the developer. The driving side bearing 23 and the conductive side bearing 24 are respectively arranged at the two ends of the box body 22 in the first direction, i.e., the driving side and the non-driving side. The powder feeding roller and the developing roller 6 are rotatably supported on the driving side bearing 23 and the conductive side bearing 24 at the two ends of the developing frame 21 in the first direction. The driving side bearing 23 is mounted at the left end of the developing frame 21, and the conductive side bearing 24 is mounted at the right end of the developing frame 21. Both the powder feeding roller and the developing roller 6 are rotatable about an axis extending in the first direction. The left end of the developing roller 6 is provided with a developing gear, and the developing gear is sleeved on the end of the roller shaft of the developing roller 6 extending out of the driving side bearing 23. The left end of the powder feeding roller is provided with a powder feeding gear, and the powder feeding gear is sleeved on the end of the roller shaft of the powder feeding roller extending out of the driving side bearing 23. The powder feeding roller can deliver the developer in the developing frame 21 to the developing roller 6. The developer absorbed by the developing roller 6 is transferred to the photosensitive drum 4 through the potential difference between the developing roller 6 and the photosensitive drum 4. The developer on the photosensitive drum 4 is transferred to a recording material (such as paper) through a transfer belt of the image forming apparatus, so as to form an image on the recording material.

[0066] The developing protective cover 27 is a cover structure, which is detachably mounted on the left side of the driving side bearing 23. The developing protective cover 27 is provided with a cylindrical portion 270, which is a cylindrical structure formed on the left side of the developing protective cover 27. The cylindrical portion 270 is mounted in the first rotating hole 131 to rotate, so that the developing unit 9 is connected with the drum unit 8 through the developing protective cover 27. The developing unit 9 can rotate around the rotating shaft of the first rotating hole 131 relative to the drum unit 8. When the developing unit 9 rotates in the reverse direction of R1 in Figure 2 , the developing roller 6 moves away from the photosensitive drum 4 to be out of contact with the photosensitive drum 4. At this time, the developing unit 9 is in the separation position, and the process cartridge cannot perform the developing work. When the developing unit 9 rotates in the direction of R1 in Figure 2 , the developing roller 6 moves towards the photosensitive drum 4 to be in contact with the photosensitive drum 4. At this time, the developing unit 9 is in the contact position, and the process cartridge can perform the developing work. The developing coupling 25 is rotatably arranged in the developing protective cover 27. The developing coupling 25 drives the developing gear and the powder feeding gear through the gear structure, and then drives the developing roller 6 and the powder feeding roller to rotate. The developing coupling 25 can receive the driving force of the main assembly side developing driving coupling of the image forming device through the part of the cylindrical portion 270 exposed outside the first rotating hole 131.

[0067] Further, referring to Figure 2 , the driving side end cover 13 is provided with an arc-shaped guide hole 133, and the developing protective cover 27 is provided with a guide protrusion 271. The guide protrusion 271 can slide in the guide hole 133 to guide the developing unit 9 to rotate from the separation position to the contact position.

[0068] Referring to Figure 3 , the isolation member 102 is used to isolate the charging roller 5 and the photosensitive drum 4. The isolation member 102 can move on the process cartridge from the first position to the second position. In the initial state, the protective cover 101 is arranged on at least a part of the drum unit 8 and / or the developing unit 9. The isolation member 102 is locked in the first position and abuts against the charging roller 5, so that there is at least a gap between the charging roller 5 and the photosensitive drum 4, and the second elastic member 51 is deformed to store the force. The protective cover 101 is removed from the process cartridge to unlock the isolation member 102. The movement of the unlocked isolation member 102 is not limited, i.e., the isolation member 102 can move away from the charging roller 5 at this time. That is, the isolation member 102 cannot isolate the charging roller 5 and the photosensitive drum 4 at this time. At the same time, under the action of the restoring force of the second elastic member 51, the charging roller 5 moves towards the photosensitive drum 4. The charging roller 5 pushes the isolation member 102 to move from the first position to the second position away from the charging roller 5. The isolation member 102 no longer isolates between the charging roller 5 and the photosensitive drum 4, so that the charging roller 5 can be in contact with the photosensitive drum 4.

[0069] The protective cover 101 can unlock the isolation member 102 directly or indirectly when it is removed, so as to realize the contact between the charging roller 5 and the photosensitive drum 4. The linkage mode of the protective cover 101 and the isolation member 102 can be various. In the embodiment, the process cartridge further comprises a first elastic member 3 arranged between the developing unit 9 and the drum unit 8, for moving the developing unit 9 towards the contact position. When the protective cover 101 is not removed, the developing unit 9 is located at the separated position, and the first elastic member 3 is deformed to store energy. By removing the protective cover 101, the first elastic member 3 is restored to drive the developing unit 9 to rotate from the separated position to the contact position. When the developing unit 9 rotates, the isolation member 102 is unlocked, and the second elastic member 51 is restored to exert a force F3 (see Figure 3 ) on the charging roller 5. The direction of the force F3 is preferably perpendicular to the first direction, so that the charging roller 5 moves towards the photosensitive drum 4. Since the isolation member 102 has been unlocked, it can be pushed by the charging roller 5 to move from the first position to the second position away from the charging roller 5, so that the isolation member 102 leaves the charging roller 5, and the charging roller 5 contacts the photosensitive drum 4.

[0070] Specifically, in the embodiment, the protective cover 101 is arranged below the drum unit 8 and the developing unit 9. Referring to Figure 1 and Figure 4 , the protective cover 101 is provided with an abutting portion 1011 for abutting with the developing unit 9, specifically with the developing frame 21, so that the developing unit 9 is located at the separated position. At this time, the first elastic member 3 is deformed to store energy. When the protective cover 101 is removed from the process cartridge, the first elastic member 3 is restored to move the developing unit 9 to the contact position, specifically to rotate the developing unit 9 along the R1 direction. The abutting portion 1011 has two, which are arranged at the positions of the protective cover 101 close to the driving side and the non-driving side (i.e. the left end and the right end of the process cartridge) of the process cartridge, so as to better exert force on the developing frame 21.

[0071] The isolation member 102 can be arranged at the driving side or the non-driving side of the process cartridge. In the embodiment, the isolation member 102 is arranged at the driving side. Specifically, referring to Figures 7-8The isolation member 102 includes a fixedly connected rotating part 1021, an isolation part 1022, a force receiving part 1023 and a locking part 1024. The rotating part 1021 is rotatably arranged on the drum frame 11, so that the isolation member 102 as a whole is rotatable, and the rotation axis of the isolation member 102 can extend in the first direction. Specifically, the isolation member 102 is movably arranged on the driving side end cover 13, and further, the isolation member 102 is rotatably arranged on the driving side end cover 13, wherein the driving side end cover 13 is provided with a receiving part 134, and the rotating part 1021 is rotatably arranged in the receiving part 134, and the receiving part 134 is further connected with a limiting part 135, and the end of the limiting part 135 is hook-shaped, which is used to prevent the rotating part 1021 from being separated from the driving side end cover 13 outwardly along the first direction.

[0072] The isolation part 1022 is used to isolate the charging roller 5 and the photosensitive drum 4, and specifically, the isolation part 1022 can be inserted between the charging roller 5 and the photosensitive drum 4, and can apply a force F1 (see Figure 3 ) to the charging roller 5, so that the charging roller 5 moves towards the direction away from the photosensitive drum 4, and at the same time, the charging roller 5 pushes the second elastic member 51 to deform and store force. The movement of the charging roller 5 towards the direction away from the photosensitive drum 4 can make the charging roller 5 (specifically, the shaft sleeve of the charging roller 5) have a gap with the photosensitive drum 4, and it should be noted that the gap means that the shaft sleeve of the charging roller 5 is not in complete contact with the photosensitive drum 4 (the complete non-contact scheme will be described in the preferred scheme below), but only means that at least part of the shaft sleeve of the charging roller 5 facing the photosensitive drum 4 has a gap with the photosensitive drum 4.

[0073] The isolation member 102 is arranged to be capable of sliding relative to the driving side end cover 13 from the first position to the second position, so that the isolation part 1022 moves towards the direction away from the charging roller 5, i.e. slides to the left, and the isolation part 1022 completely separates from the charging roller 5 (i.e. the isolation part 1022 is not in complete contact with the charging roller 5) or the isolation part 1022 mostly separates from the charging roller 5 (for example, the isolation part 1022 only contacts the charging roller 5 at the end), and the charging roller 5 can move towards the photosensitive drum 4 under the restoring force of the deformation of the second elastic member 51 and push away the isolation part 1022, and due to the departure of the isolation part 1022, the charging roller 5 can contact the photosensitive drum 4. Further, the sliding of the isolation member 102 from the first position to the second position is along the first direction (in this embodiment, specifically, sliding to the left along the first direction), i.e. parallel to the direction of the rotation axis of the photosensitive drum 4 and the charging roller 5. Specifically, the isolation part 1022 protrudes from the rotating part 1021 along the first direction, and the isolation part 1022 abuts against the end (i.e. the left end) of the charging roller 5 located on the driving side. Further, referring to Figure 7 , the isolation part 1022 is provided with a first isolation inclined surface 10221, and the isolation part 1022 abuts against the end of the charging roller 5 through the first isolation inclined surface 10221. Specifically, referring toFigure 3 and Figure 7 The first isolation inclined surface 10221 is inclined to the first direction, and is inclined to the direction of the photosensitive drum 4 in the direction towards the charging roller 5, so that when the isolation part 1022 moves away from the charging roller 5 along the first direction, the end part of the charging roller 5 can slide along the first isolation inclined surface 10221 to the direction close to the photosensitive drum 4, so that the movement of the charging roller 5 is more smooth. Preferably, the first isolation inclined surface 10221 abuts against the roller shaft end part of the charging roller 5, but does not abut against the shaft sleeve of the charging roller 5, so as to prevent the shaft sleeve from being deformed under force.

[0074] The force receiving part 1023 is used to be driven by the developing unit 9 when the developing unit 9 rotates from the separation position to the contact position, so that the isolation member 102 rotates. Specifically, the force receiving part 1023 protrudes from the rotating part 1021 in a direction perpendicular to the first direction, and the developing unit 9 is provided with a force applying part 272, which is specifically provided on the developing frame 21, and further, the force applying part 272 is provided on the developing cover 27, please refer to Figure 2 and Figure 4 When the developing cover 27 rotates with the developing unit 9, the force applying part 272 acts on the force receiving part 1023 along the R1 direction with the developing unit 9, so that the isolation member 102 rotates along the R2 direction.

[0075] The locking part 1024 is used to lock with the locking structure 136 on the drum unit 8, please refer to Figure 3 The locking part 1024 is specifically formed on the side of the force receiving part 1023 towards the driving side end cover 13, and the locking structure 136 is specifically formed on the inner side of the driving side end cover 13, please refer to 6-8, at the first position, the locking part 1024 is locked with the locking structure 136, when the developing unit 9 rotates to the contact position, the force applying part 272 acts on the force receiving part 1023 to make the isolation member 102 rotate along the R2 direction (please refer to Figure 4 and Figure 10 ), so that the locking part 1024 is away from the locking structure 136 to achieve unlocking, after unlocking, the isolation member 102 can slide to the left from the first position to the second position (please refer to Figure 11 ). Specifically, please refer to Figure 3 The locking part 1024 is a slope formed on the force receiving part 1023, and the locking structure 136 is a slope formed on the inner side of the driving side end cover 13, the locking part 1024 and the locking structure 136 are mutually matched slopes, and the inclination directions of the two can be specifically inclined to the first direction, when the force receiving part 1023 does not receive the force of the force applying part 272, the locking structure 136 can lock the locking part 1024 to prevent the isolation member 102 from rotating by itself.

[0076] Please refer to Figure 3 and Figure 5In the embodiment, the processing cartridge further comprises an isolation boss 141 fixedly arranged at one end (i.e. the right end) of the drum frame 11 on the non-driving side, i.e. when the isolation part 1022 is inserted between the charging roller 5 and the photosensitive drum 4, the force F1 applied to the charging roller 5 makes the charging roller 5 slide not only in the direction away from the photosensitive drum 4, but also to the right end, so that the isolation boss 141 abuts against the end of the charging roller 5 on the non-driving side and further applies a force F2 to the charging roller 5, i.e. the isolation boss 141 and the isolation member 102 are oppositely arranged, and the two abut against the two ends of the charging roller 5 in the first direction respectively, so that both ends of the charging roller 5 can be subjected to the abutting force (F1 and F2), so that both ends of the charging roller 5 can be away from the photosensitive drum 4, and the outer circumferential surface of the shaft sleeve of the charging roller 5 is completely not in contact with the outer circumferential surface of the photosensitive drum 4. Further, referring to Figure 5 The isolation boss 141 is arranged on the inner side of the conductive side end cover 14, and the isolation boss 141 is provided with a second isolation inclined surface 1411 for abutting against the end of the charging roller 5. Specifically, the second isolation inclined surface 1411 is inclined to the first direction, and the second isolation inclined surface 1411 is inclined to the direction of the photosensitive drum 4 in the direction of the charging roller 5, so that when the isolation part 1022 is close to the charging roller 5 along the first direction, the end of the charging roller 5 can slide away from the photosensitive drum 4 along the second isolation inclined surface 1411, and when the isolation part 1022 is away from the charging roller 5 along the first direction, the end of the charging roller 5 can slide towards the photosensitive drum 4 along the second isolation inclined surface 1411, so that the movement of the charging roller 5 is more stable and smooth. In addition, the arrangement of the inclination direction of the second isolation inclined surface 10221 makes the end of the charging roller 5 slide to the left end while approaching the photosensitive drum 4 when the second elastic member 51 applies a force F3 to the charging roller 5 when the end of the charging roller 5 is subjected to the force F2 of the isolation boss 141, so as to better push the isolation member 102 at the left end of the charging roller 5 to move to the left, so that the isolation part 1022 of the isolation member 102 is away from the charging roller 5. Preferably, the second isolation inclined surface 1411 abuts against the roller shaft end of the charging roller 5, but not the shaft sleeve of the charging roller 5, so as to prevent the shaft sleeve from deforming under stress. The first isolation inclined surface 10221 and the second isolation inclined surface 1411 are oppositely and symmetrically arranged, which is further conducive to the stable movement of the charging roller 5.

[0077] In addition, when the second isolation inclined surface 1411 is not arranged on the isolation boss 141, the charging roller 5 approaches the photosensitive drum 4 by the action force F3 of the second elastic member 51, and at the same time, the left end of the charging roller 5 applies an action force (the direction is opposite to the force F1) to the first isolation inclined surface 10221, which can also push the isolation member 102 to slide to the left from the first position to the second position.

[0078] The working process of the processing cartridge of the embodiment is as follows:

[0079] Referring to Figure 1 , after the process cartridge is assembled in the factory, the protective cover 101 is arranged on the drum unit 8 and the developing unit 9, the abutting portion 1011 of the protective cover 101 abuts against the developing frame 21, so that the developing unit 9 is located at a separation position where the developing roller 6 is separated from the photosensitive drum 4, the guide protrusion 271 is located at the front end of the guide hole 133, the first elastic member 3 is deformed to store force, at the same time, the isolation member 102 is located at the first position, the locking portion 1024 is locked with the locking structure 136, the isolation portion 1022 abuts against the left end of the charging roller 5, the isolation boss 141 abuts against the right end of the charging roller 5, so that the charging roller 5 has a gap with the photosensitive drum 4, and the second elastic member 51 is deformed to store force.

[0080] Referring to Figure 1 , Figure 2 and Figure 9 , when the user removes the protective cover 101, the abutting portion 1011 is away from the developing frame 21, the developing unit 9 is rotated along the direction R1 to a contact position where the developing roller 6 contacts the photosensitive drum 4 under the action of the first elastic member 3, the guide protrusion 271 moves to the rear end in the guide hole 133 along with the developing unit 9, the developing cover 27 is rotated along with the developing unit 9, the force applying portion 272 on the developing cover 27 is rotated to act on the force receiving portion 1023 of the isolation member 102, the isolation member 102 is rotated along the direction R2 (see Figure 4 and Figure 10 ), the locking portion 1024 is rotated and away from the locking structure 136, until the locking portion 1024 is completely away from the locking structure 136, the isolation member 102 is unlocked, because the second elastic member 51 has a force towards the photosensitive drum 4 on the charging roller 5, under the action of the second elastic member 51, the charging roller 5 moves towards the photosensitive drum 4, the right end of the charging roller 5 slides on the second isolation slope 1411, so that the charging roller 5 slides to the left, because the isolation member 102 has been unlocked, the isolation member 102 can be pushed by the charging roller 5 to slide to the left from the first position to the second position along the first direction (see Figure 11 ), so that the isolation portion 1022 is away from the charging roller 5, the outer circumferential surface of the shaft sleeve of the charging roller 5 contacts the outer circumferential surface of the photosensitive drum 4, so that the process cartridge can be installed and normally work.

[0081] In other embodiments, the isolation boss 141 can also not be provided, at this time, the charging roller 5 only has the left end abutting against the isolation member 102, and the right end of the shaft sleeve of the charging roller 5 can be in contact with the photosensitive drum 4, but the shaft sleeve of the charging roller 5 can still form a gap between the photosensitive drum 4 along most of the axis, so as to reduce the pollution of the rubber structure on the surface of the shaft sleeve of the charging roller 5 to the photosensitive coating on the surface of the photosensitive drum 4. In some embodiments, when the isolation boss 141 is not provided, the length of the isolation part 1022 of the isolation member 102 can be extended to have a longer length in the axis direction of the charging roller 5, so as to reduce the degree of contact between the right end of the shaft sleeve of the charging roller 5 and the photosensitive drum 4 or make the right end of the shaft sleeve of the charging roller 5 not contact the photosensitive drum 4 at all. When the shaft sleeve of the charging roller 5 is not in contact with the photosensitive drum 4 at all, the shaft sleeve can be prevented from being deformed by the photosensitive drum 4.

[0082] The utility model discloses a protective cover 101 and the isolation member 102 that can be linked with it are set, when the protective cover 101 is not taken down, the isolation member 102 makes charging roller 5 and photosensitive drum 4 have the gap between, when taking down the protective cover 101, the isolation member 102 removes the locking, thereby from the gap between charging roller 5 and photosensitive drum 4, make the processing box can install and work, relative to prior art in the protective cover 101 also taking down the isolation bolt, this scheme only needs to take down the protective cover 101, reduced the operation process of user, also avoided the user only remembered taking down the protective cover 101 and forget taking down the isolation bolt and made the processing box not normal work condition.

[0083] Embodiment two

[0084] Reference Figures 12-15 , this embodiment and embodiment one are basically same, different in that: the isolation member 102 and the related structure of this embodiment are set on the non-drive side of the processing box instead of the drive side.

[0085] Reference Figures 12-14 , in this embodiment, the isolation member 102 is set on the conductive side end cover 14. Correspondingly, the locking structure 136, the accommodating part 134 and the limiting part 135 are set on the conductive side end cover 14, and the force applying part 272 is set on the non-drive side of the developing frame 21, specifically, the force applying part 272 is set on the conductive side bearing 24. Reference Figure 15 , the isolation boss 141 is set on the drive side end cover 13. The principle of this embodiment is similar to that of embodiment one, which will not be repeated here.

[0086] The above merely describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, some modifications and improvements or free combinations of the above technical solutions can be made, including free combinations of technical features among different embodiments, which all belong to the protection scope of the present application.

Claims

1. A process cartridge to be detachably mounted to an image forming apparatus, characterized by comprising: The cartridge comprises: a drum unit including a drum frame, a photosensitive drum rotatably disposed on the drum frame about an axis extending in a first direction, a charging roller rotatably disposed on the drum frame about an axis extending in the first direction, and a second elastic member for moving the charging roller in a direction toward the photosensitive drum; a developing unit including a developing frame and a developing roller rotatably disposed on the developing frame about an axis extending in the first direction; a protective cover; and an isolation member for isolating the charging roller and the photosensitive drum, the isolation member being movable on the cartridge from a first position to a second position; in an initial state, the protective cover is provided on at least a portion of the drum unit and / or the developing unit, the isolation member is locked in the first position and is in abutment with the charging roller, such that the charging roller and the photosensitive drum have at least a partial gap therebetween, and the second elastic member is deformed to store an elastic force; removal of the protective cover from the cartridge causes the isolation member to be unlocked, the second elastic member recovers from the deformation to move the charging roller in the direction toward the photosensitive drum, and the unlocked isolation member is pushed by the charging roller to move from the first position to the second position in a direction away from the charging roller, such that the charging roller is in contact with the photosensitive drum. The cartridge further comprises a first elastic member for moving the developing unit in a direction toward a contact position in which the developing roller is in contact with the photosensitive drum; 2. The process cartridge according to claim 1, wherein, the protective cover is provided with an abutment portion; in an initial state, the abutment portion is in abutment with the developing unit, such that the developing unit is located at a separation position in which the developing roller is separated from the photosensitive drum, the first elastic member is deformed to store an elastic force, the isolation member is located at the first position, the charging roller and the photosensitive drum have at least a partial gap therebetween, and the second elastic member is deformed to store an elastic force; removal of the protective cover from the cartridge causes the abutment portion to move away from the developing unit, the first elastic member recovers from the deformation to move the developing unit toward the contact position in which the developing roller is in contact with the photosensitive drum, the developing unit causes the isolation member to be unlocked to enable the isolation member to be pushed by the charging roller to move from the first position to the second position, and the second elastic member recovers from the deformation to move the charging roller in the direction toward the photosensitive drum and into contact with the photosensitive drum. The isolation member comprises an isolation portion which, at the first position, is inserted between the charging roller and the photosensitive drum, such that the charging roller is moved in a direction away from the photosensitive drum, and the isolation portion is configured to slide from the first position to the second position to move away from the charging roller, such that the charging roller is in contact with the photosensitive drum.

3. The process cartridge of claim 2 wherein, The isolation member is configured to slide in the first direction from the first position to the second position.

4. The process cartridge of claim 3 wherein, The developing unit is provided with a force applying portion, the drum unit is provided with a locking structure, the isolation member further comprises a force receiving portion and a locking portion, and the isolation member is configured to rotate; 5. The process cartridge of claim 3 wherein, at the first position, the locking portion is locked with the locking structure; ​ When the developing unit moves to the contact position, the force applying part acts on the force receiving part to rotate the isolation member, and the locking part rotates to be away from the locking structure to be unlocked, and after being unlocked, the isolation member can slide from the first position to the second position.

6. The process cartridge of claim 5 wherein, The isolation member is arranged to rotate around an axis extending in the first direction.

7. The process cartridge of claim 5 wherein, The isolation member further comprises a rotating part rotatably arranged on the drum frame. The isolation part is arranged to protrude from the rotating part in the first direction. The force receiving part is arranged to protrude from the rotating part in a direction perpendicular to the first direction. The locking part is formed on the force receiving part.

8. The process cartridge of claim 5 wherein, The locking part and the locking structure are mutually adapted inclined surfaces.

9. The process cartridge of claim 5 wherein, The drum frame comprises an end cover, and the locking structure is formed inside the end cover. The developing frame comprises a developing cover and a bearing, and the force applying part is arranged on the developing cover or the bearing.

10. The process cartridge of claim 7 wherein, The end cover is provided with a receiving part, and the rotating part is rotatably arranged in the receiving part. The receiving part is further connected with a limiting part for preventing the rotating part from being outwardly separated from the end cover in the first direction.

11. The process cartridge of claim 3, wherein, The isolation part is provided with a first isolation inclined surface inclined to the first direction, and the first isolation inclined surface is inclined to the direction of the photosensitive drum in the direction of the charging roller, and the first isolation inclined surface is used to abut against the end of the charging roller.

12. The process cartridge of claim 1, wherein, The processing cartridge further comprises an isolation boss fixedly arranged on the drum frame, and the isolation member and the isolation boss respectively abut against two ends of the charging roller opposite in the first direction, so that the charging roller is completely not in contact with the photosensitive drum.

13. The process cartridge of claim 12, wherein, The drum frame comprises an end cover, and the isolation boss is arranged inside the end cover, and the isolation boss is provided with a second isolation inclined surface inclined to the first direction, and the second isolation inclined surface is inclined to the direction of the photosensitive drum in the direction of the charging roller, and the second isolation inclined surface is used to abut against the end of the charging roller.

14. The process cartridge according to any one of claims 1 to 13, wherein, The isolation member is arranged on the driving side of the processing cartridge.

15. The process cartridge according to any one of claims 1 to 13, wherein, The isolation member is arranged on the non-driving side of the processing cartridge.

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